One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(3,7)(6,8)(9,10,15,20)(11,21,25,36)(12,17,27,34)(13,19,14,18)(16,29,32,24)(22,37,40,31)(23,38,39,30)(26,35,28,33)(2,6)(5,8)(9,11,15,25)(10,16,20,32)(12,22,27,40)(13,24,14,29)(17,30,34,38)(18,21,19,36)(23,28,39,26)(31,35,37,33)(1,2)(3,8)(4,6)(5,7)(9,12)(10,17)(11,22)(13,28)(14,26)(15,27)(16,30)(18,35)(19,33)(20,34)(21,37)(23,29)(24,39)(25,40)(31,36)(32,38) involution — undirected(9,12)(10,17)(11,23)(13,26)(14,28)(15,27)(16,31)(18,33)(19,35)(20,34)(21,38)(22,29)(24,40)(25,39)(30,36)(32,37) involution — undirected(9,13,15,14)(10,18,20,19)(11,24,25,29)(12,26,27,28)(16,21,32,36)(17,33,34,35)(22,23,40,39)(30,31,38,37)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.